Value investing starts with low PE stocks, but it shouldn’t be an investor’s only financial metric.

What do Warren Buffett, Ben Graham, Seth Klarman, and Peter Lynch all have in common? Besides being wildly successful investors, they’re all are adherents to value investing, a method where one attempts to buy securities that have a higher intrinsic value than their current price.

One of the most basic forms of value investing is to find stocks with low price-to-earnings (PE) ratios. The PE ratio is a simple ratio that divides the current price per share of a company by the earnings per share over the trailing-12-month period. The logic behind buying low PE stocks is simple: As an investor, you are ultimately entitled to a pro-rata portion of company earnings, so paying the lowest cost, or multiple, for those earnings is preferable than paying a higher multiple. Essentially, your dollar is buying a larger portion of company earnings than it would with a high-multiple stock.